Dawn and Maisie had some good playtime at turnout today. Maisie actually invited Dawn (who is dominant; Maisie's very submissive) to play face tag, bobbing her head, pawing with one front leg and doing her little half-rear in place - this is usually, in my experience, more of a gelding game - and Dawn played for a moment before driving Maisie away. Dawn also likes to herd Maisie as if she were a cow - Dawn, although a TB, has worked cows and really enjoys it and has very good instincts. Then Dawn decided it was time to really rock and roll - she squealed and galloped around, throwing in big bucks for good measure. At one point she did a sequence of every-one-stride lead changes while flinging her head from side to side - this is a signature Dawn move. Then she did her excited paw/rear/roll sequence, ending with a leap into the air followed immediately by a huge buck, then more galloping.
When Miranda was doing some of her threatening gestures at me - I drove her away - Dawn took umbrage at that, although otherwise she's pretty much been ignoring Miranda. Dawn came over to fenceline - I was standing in the aisle between the mares' turnout and Miranda's paddock - and stuck her head over, pinning her ears and shaking her head, and biting the fence from time to time. I don't know if she was guarding me, or simply took Miranda's actions as a challenge to her (Dawn's) authority in the herd.
My daughter should be arriving home from Florida this afternoon, and will then have a chance to evaluate Miranda and her behavior.